Data-Link Switching: Difference between revisions

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{{Short description|Tunneling protocol}}

'''Data-Link Switching''' ('''DLSw''') is a [[tunneling protocol]] designed to tunnel unroutable, non-IP based protocols such as IBM [[Systems Network Architecture]] (SNA) and [[NetBIOS Frames protocol|NBF]] over an IP network.

DLSw was initially documented in IETF RFC 1434 in 1993. In 1995 it was further documented in the IETF RFC 1795. DLSw version 2 was presented in 1997 in IETF RFC 2166 as an improvement to RFC 1795. [[Cisco]] Systems has its own proprietary extensions to DLSw in DLSw+. According to Cisco, DLSw+ is 100% IETF RFC 1795 compliant but includes some proprietary extensions that can be used when both devices are Cisco.<ref>{{cite web |url=http://docwiki.cisco.com/wiki/Data-Link_Switching |title=Data-Link Switching (DLSw) |publisher=[[Cisco]] |accessdate=2011-06-16}}</ref>

Some organisations are starting to replace DLSw tunneling with the more modern IPDLC[[Enterprise protocolExtender]]<ref>{{cite web |last=IBM Corporation |title=Enterprise Extender |url=http://publib.boulder.ibm.com/infocenter/zos/basics/index.jsp?topic=/com.ibm.zos.znetwork/znetwork_239.htm |accessdate=September 3, 2012}}</ref> (EE) protocol which wrapsis a feature of IBM APPN on z/OS systems. Microsoft refers to EE as [[IPDLC]]. Enterprise Extender uses DLCUDP traffic at the [[Transporttransport Layerlayer]] rather than the [[Networknetwork Layerlayer]].<ref>{{cite web |url=http://www-1.ibm.com/support/docview.wss?rs=852&uid=swg27006667 |title=Understanding Enterprise Extender, Part 1 - Concepts and Considerations |publisher=[[IBM]] |accessdate=2008-09-15}}</ref>

[[Cisco]] Systems has its own proprietary extensions to DLSw in DLSw+. According to Cisco, DLSw+ is 100% IETF RFC 1795 compliant but includes some proprietary extensions that can be used when both devices are Cisco.<ref>{{cite web|url=http://www.cisco.com/en/US/docs/internetworking/technology/handbook/DLSw.html|title=Data-Link Switching (DLSw)|publisher=[[Cisco]]|accessdate=2008-09-15}}</ref>

Cisco deploy Enterprise Extender on their hardware via the IOS feature known as SNAsW (SNA Switch).

Some organisations are starting to replace DLSw tunneling with the more modern IPDLC protocol, which wraps DLC traffic at the [[Transport Layer]] rather than the [[Network Layer]].<ref>{{cite web|url=http://www-1.ibm.com/support/docview.wss?rs=852&uid=swg27006667|title=Understanding Enterprise Extender, Part 1 - Concepts and Considerations|publisher=[[IBM]]|accessdate=2008-09-15}}</ref>

==See also==

*[[IBM Systems Network Architecture]]

*[[Microsoft Host Integration Server]]

*[[Synchronous Data Link Control]]

*[[IBM Systems Network Architecture]]

==References==

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[[Category:Tunneling protocols]]

[[Category:Systems Network Architecture|Data-Link Switching]]

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